Binaural multi-channel decoder in the context of non-energy-conserving upmix rules
AssigneeDolby International AB
InventorLars Villemoes
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Abstract
A multi-channel decoder for generating a binaural signal from a downmix signal using upmix rule information on an energy-error introducing upmix rule for calculating a gain factor based on the upmix rule information and characteristics of head related transfer function based filters corresponding to upmix channels. The one or more gain factors are used by a filter processor for filtering the downmix signal so that an energy corrected binaural signal having a left binaural channel and a right binaural channel is obtained.
Claims9
A multi-channel decoder apparatus for generating a binaural signal from an input signal derived from an original multi-channel signal using parameters, the apparatus comprising:
- a gain factor calculator for calculating at least one gain factor for reducing or eliminating an energy-error, based on weighting parameters related to input channels of the input signal and filter characteristics of head related transfer function based filters;
- and
- a filter processor for filtering the input signal using the at least one gain factor, and the filter characteristics to obtain an energy-corrected binaural signal,
- wherein the gain factor calculator is operative to calculate the at least one gain factor for a binaural channel of the binaural signal based on a ratio of a weighted linear combination of energies of channel impulse responses of the head related transfer function based filters for the binaural channel.
A method of multi-channel decoding for generating a binaural signal from an input signal derived from an original multi-channel signal using parameters, the method comprising:
- calculating at least one gain factor for reducing or eliminating an energy-error, based on weighting parameters related to input channels of the input signal and filter characteristics of head related transfer function based filters;
- and
- filtering the input signal using the at least one gain factor, and the filter characteristics, wherein the gain factor for a binaural channel of the binaural signal is calculated based on a ratio of a weighted linear combination of energies of channel impulse responses of the head related transfer function based filters for the binaural channel.
Dependencies are inferred from the claim text.